This file is indexed.

/usr/include/android-22/hardware/nfc.h is in android-headers-22 23-0ubuntu4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
/*
 * Copyright (C) 2011, 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef ANDROID_NFC_HAL_INTERFACE_H
#define ANDROID_NFC_HAL_INTERFACE_H

#include <stdint.h>
#include <strings.h>
#include <sys/cdefs.h>
#include <sys/types.h>

#include <hardware/hardware.h>

__BEGIN_DECLS


/* NFC device HAL for NCI-based NFC controllers.
 *
 * This HAL allows NCI silicon vendors to make use
 * of the core NCI stack in Android for their own silicon.
 *
 * The responibilities of the NCI HAL implementation
 * are as follows:
 *
 * - Implement the transport to the NFC controller
 * - Implement each of the HAL methods specified below as applicable to their silicon
 * - Pass up received NCI messages from the controller to the stack
 *
 * A simplified timeline of NCI HAL method calls:
 * 1) Core NCI stack calls open()
 * 2) Core NCI stack executes CORE_RESET and CORE_INIT through calls to write()
 * 3) Core NCI stack calls core_initialized() to allow HAL to do post-init configuration
 * 4) Core NCI stack calls pre_discover() to allow HAL to prepare for RF discovery
 * 5) Core NCI stack starts discovery through calls to write()
 * 6) Core NCI stack stops discovery through calls to write() (e.g. screen turns off)
 * 7) Core NCI stack calls pre_discover() to prepare for RF discovery (e.g. screen turned back on)
 * 8) Core NCI stack starts discovery through calls to write()
 * ...
 * ...
 * 9) Core NCI stack calls close()
 */
#define NFC_NCI_HARDWARE_MODULE_ID "nfc_nci"
#define NFC_NCI_BCM2079X_HARDWARE_MODULE_ID "nfc_nci.bcm2079x"
#define NFC_NCI_CONTROLLER "nci"

/*
 *  nfc_nci_module_t should contain module-specific parameters
 */
typedef struct nfc_nci_module_t {
    /**
     * Common methods of the NFC NCI module.  This *must* be the first member of
     * nfc_nci_module_t as users of this structure will cast a hw_module_t to
     * nfc_nci_module_t pointer in contexts where it's known the hw_module_t references a
     * nfc_nci_module_t.
     */
    struct hw_module_t common;
} nfc_nci_module_t;

/*
 * HAL events that can be passed back to the stack
 */
typedef uint8_t nfc_event_t;

enum {
    HAL_NFC_OPEN_CPLT_EVT           = 0x00,
    HAL_NFC_CLOSE_CPLT_EVT          = 0x01,
    HAL_NFC_POST_INIT_CPLT_EVT      = 0x02,
    HAL_NFC_PRE_DISCOVER_CPLT_EVT   = 0x03,
    HAL_NFC_REQUEST_CONTROL_EVT     = 0x04,
    HAL_NFC_RELEASE_CONTROL_EVT     = 0x05,
    HAL_NFC_ERROR_EVT               = 0x06
};

/*
 * Allowed status return values for each of the HAL methods
 */
typedef uint8_t nfc_status_t;

enum {
    HAL_NFC_STATUS_OK               = 0x00,
    HAL_NFC_STATUS_FAILED           = 0x01,
    HAL_NFC_STATUS_ERR_TRANSPORT    = 0x02,
    HAL_NFC_STATUS_ERR_CMD_TIMEOUT  = 0x03,
    HAL_NFC_STATUS_REFUSED          = 0x04
};

/*
 * The callback passed in from the NFC stack that the HAL
 * can use to pass events back to the stack.
 */
typedef void (nfc_stack_callback_t) (nfc_event_t event, nfc_status_t event_status);

/*
 * The callback passed in from the NFC stack that the HAL
 * can use to pass incomming data to the stack.
 */
typedef void (nfc_stack_data_callback_t) (uint16_t data_len, uint8_t* p_data);

/* nfc_nci_device_t starts with a hw_device_t struct,
 * followed by device-specific methods and members.
 *
 * All methods in the NCI HAL are asynchronous.
 */
typedef struct nfc_nci_device {
    /**
     * Common methods of the NFC NCI device.  This *must* be the first member of
     * nfc_nci_device_t as users of this structure will cast a hw_device_t to
     * nfc_nci_device_t pointer in contexts where it's known the hw_device_t references a
     * nfc_nci_device_t.
     */
    struct hw_device_t common;
    /*
     * (*open)() Opens the NFC controller device and performs initialization.
     * This may include patch download and other vendor-specific initialization.
     *
     * If open completes successfully, the controller should be ready to perform
     * NCI initialization - ie accept CORE_RESET and subsequent commands through
     * the write() call.
     *
     * If open() returns 0, the NCI stack will wait for a HAL_NFC_OPEN_CPLT_EVT
     * before continuing.
     *
     * If open() returns any other value, the NCI stack will stop.
     *
     */
    int (*open)(const struct nfc_nci_device *p_dev, nfc_stack_callback_t *p_cback,
            nfc_stack_data_callback_t *p_data_cback);

    /*
     * (*write)() Performs an NCI write.
     *
     * This method may queue writes and return immediately. The only
     * requirement is that the writes are executed in order.
     */
    int (*write)(const struct nfc_nci_device *p_dev, uint16_t data_len, const uint8_t *p_data);

    /*
     * (*core_initialized)() is called after the CORE_INIT_RSP is received from the NFCC.
     * At this time, the HAL can do any chip-specific configuration.
     *
     * If core_initialized() returns 0, the NCI stack will wait for a HAL_NFC_POST_INIT_CPLT_EVT
     * before continuing.
     *
     * If core_initialized() returns any other value, the NCI stack will continue
     * immediately.
     */
    int (*core_initialized)(const struct nfc_nci_device *p_dev, uint8_t* p_core_init_rsp_params);

    /*
     * (*pre_discover)() Is called every time before starting RF discovery.
     * It is a good place to do vendor-specific configuration that must be
     * performed every time RF discovery is about to be started.
     *
     * If pre_discover() returns 0, the NCI stack will wait for a HAL_NFC_PRE_DISCOVER_CPLT_EVT
     * before continuing.
     *
     * If pre_discover() returns any other value, the NCI stack will start
     * RF discovery immediately.
     */
    int (*pre_discover)(const struct nfc_nci_device *p_dev);

    /*
     * (*close)() Closed the NFC controller. Should free all resources.
     */
    int (*close)(const struct nfc_nci_device *p_dev);

    /*
     * (*control_granted)() Grant HAL the exclusive control to send NCI commands.
     * Called in response to HAL_REQUEST_CONTROL_EVT.
     * Must only be called when there are no NCI commands pending.
     * HAL_RELEASE_CONTROL_EVT will notify when HAL no longer needs exclusive control.
     */
    int (*control_granted)(const struct nfc_nci_device *p_dev);

    /*
     * (*power_cycle)() Restart controller by power cyle;
     * HAL_OPEN_CPLT_EVT will notify when operation is complete.
     */
    int (*power_cycle)(const struct nfc_nci_device *p_dev);
} nfc_nci_device_t;

/*
 * Convenience methods that the NFC stack can use to open
 * and close an NCI device
 */
static inline int nfc_nci_open(const struct hw_module_t* module,
        nfc_nci_device_t** dev) {
    return module->methods->open(module, NFC_NCI_CONTROLLER,
        (struct hw_device_t**) dev);
}

static inline int nfc_nci_close(nfc_nci_device_t* dev) {
    return dev->common.close(&dev->common);
}
/*
 * End NFC NCI HAL
 */

/*
 * This is a limited NFC HAL for NXP PN544-based devices.
 * This HAL as Android is moving to
 * an NCI-based NFC stack.
 *
 * All NCI-based NFC controllers should use the NFC-NCI
 * HAL instead.
 * Begin PN544 specific HAL
 */
#define NFC_HARDWARE_MODULE_ID "nfc"

#define NFC_PN544_CONTROLLER "pn544"

typedef struct nfc_module_t {
    /**
     * Common methods of the NFC NXP PN544 module.  This *must* be the first member of
     * nfc_module_t as users of this structure will cast a hw_module_t to
     * nfc_module_t pointer in contexts where it's known the hw_module_t references a
     * nfc_module_t.
     */
    struct hw_module_t common;
} nfc_module_t;

/*
 * PN544 linktypes.
 * UART
 * I2C
 * USB (uses UART DAL)
 */
typedef enum {
    PN544_LINK_TYPE_UART,
    PN544_LINK_TYPE_I2C,
    PN544_LINK_TYPE_USB,
    PN544_LINK_TYPE_INVALID,
} nfc_pn544_linktype;

typedef struct {
    /**
     * Common methods of the NFC NXP PN544 device.  This *must* be the first member of
     * nfc_pn544_device_t as users of this structure will cast a hw_device_t to
     * nfc_pn544_device_t pointer in contexts where it's known the hw_device_t references a
     * nfc_pn544_device_t.
     */
    struct hw_device_t common;

    /* The number of EEPROM registers to write */
    uint32_t num_eeprom_settings;

    /* The actual EEPROM settings
     * For PN544, each EEPROM setting is a 4-byte entry,
     * of the format [0x00, addr_msb, addr_lsb, value].
     */
    uint8_t* eeprom_settings;

    /* The link type to which the PN544 is connected */
    nfc_pn544_linktype linktype;

    /* The device node to which the PN544 is connected */
    const char* device_node;

    /* On Crespo we had an I2C issue that would cause us to sometimes read
     * the I2C slave address (0x57) over the bus. libnfc contains
     * a hack to ignore this byte and try to read the length byte
     * again.
     * Set to 0 to disable the workaround, 1 to enable it.
     */
    uint8_t enable_i2c_workaround;
    /* I2C slave address. Multiple I2C addresses are
     * possible for PN544 module. Configure address according to
     * board design.
     */
    uint8_t i2c_device_address;
} nfc_pn544_device_t;

static inline int nfc_pn544_open(const struct hw_module_t* module,
        nfc_pn544_device_t** dev) {
    return module->methods->open(module, NFC_PN544_CONTROLLER,
        (struct hw_device_t**) dev);
}

static inline int nfc_pn544_close(nfc_pn544_device_t* dev) {
    return dev->common.close(&dev->common);
}
/*
 * End PN544 specific HAL
 */

__END_DECLS

#endif // ANDROID_NFC_HAL_INTERFACE_H